Please Help Me!

[Punchinello]

It might not be quite appropriate for me to post this thread here but I'm studying digital circuit and I'm pretty confused with some terminologies like VDD, VCC and all those abbreviations. Where can I get help? Thank you very much!

[David L.]

In the first instance, you need a Glossary - it's like a dictionary with an alphabetical list of terms or words used in a particular area or subject.

Try
Glossary of Terms - Tyco Electronics

for a start

and then Google 'digital circuitry' for more sites.